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A new method for preventing pulse pileup in scintillation detectors
Eiichi Tanaka1, Tomohide Ohmura, Takaji Yamashita
1Hamamatsu Photonics K K, Tokyo Branch, Japan.
Physics in Medicine and Biology
|February 12, 2002
Summary
A novel gated integral (G-INT) method minimizes pulse pileup in scintillation detectors. This technique improves pulse height resolution at high count rates by adjusting integration periods and correcting for preceding pulses.
Area of Science:
- Nuclear instrumentation
- Radiation detection and measurement
Background:
- Pulse pileup significantly degrades performance in scintillation detectors.
- Accurate energy measurement is crucial for radiation detection applications.
Purpose of the Study:
- To introduce and evaluate a new method, gated integral (G-INT), for preventing pulse pileup in scintillation detectors.
- To compare the performance of G-INT with existing methods like Wong's sum (W-SUM).
Main Methods:
- The G-INT method calculates event energy using a gated integral and a variable integration period.
- Pre-pulse pileup is corrected by subtracting remnant energy from preceding pulses.
- Monte Carlo simulations were used to assess G-INT's performance against W-SUM and other techniques.
Main Results:
- G-INT demonstrated the least degradation in pulse height resolution across various count rates.
- The G-INT method showed superior performance compared to W-SUM, variable sampling-time, and delay-line clipping.
- Statistical noise differences between gated integrals and weighted sums explain performance variations.
Conclusions:
- The G-INT method offers an effective solution for mitigating pulse pileup in scintillation detectors.
- G-INT provides enhanced pulse height resolution, particularly beneficial for high-count-rate applications.
- This method represents a significant advancement in radiation detection technology.